//Monitoring the active part.
class Delegator{
 MPart activePart;

 public Delegator{
  this.addListener(SWT.KeyDown, new Listener{
    //pass the Keyboard Events to the activePart here
    activePart.getListeners.PASS_EVENTS_HERE
  });

}

@Inject
    private void getActivePart(@Named(IServiceConstants.ACTIVE_PART) MPart part) {
        if (part != null) {
            activePart = part;
        }
    }

class PartContribution{

 //the part which the PartContribution is in will be injected here
 @Inject
 MPart part;

 public PartContribution{
   //Listen to the events, passed to the active part.
   part.addListener...
 }

}